1/2+1/4+1/8+1/16+1/32.......1/2048=?根据等比数列,=1-(1/2)^10]/(1-1/2)=1-1/2048=2047/2048
1/2+1/4+1/8+1/16+1/32.......1/2048=1-1/2048=2047/2048